What is Moodle?
Moodle is a software package for producing Internet-based courses and web sites. It is a global development project designed to support a social constructionist framework of education.
The word Moodle was originally an acronym for Modular Object-Oriented Dynamic Learning Environment, which is mostly useful to programmers and education theorists. It’s also a verb that describes the process of lazily meandering through something, doing things as it occurs to you to do them, an enjoyable tinkering that often leads to insight and creativity. As such it applies both to the way Moodle was developed, and to the way a student or teacher might approach studying or teaching an online course. Anyone who uses Moodle is a Moodler.This description taken from the About Moodle page at Moodle.org